Ningbo Materials has made progress in R&D and application of transparent ceramics

The yttrium aluminum garnet (GGAG) is a new type of oxide scintillation material. Due to its high density, fast decay, high light yield, short afterglow, and environmental friendliness, it is highly likely that it will become a successor to HiLight, GOS, and Gemstone. New medical CT detector material. In addition, compared with CsI (Tl), CdWO4 and other scintillation crystals, GGAG has obvious advantages in attenuation rate, anti-irradiation damage, environmental integrity and processability, and it also shows good application prospects in security CT. After four years of research and development, the Optoelectronic Functional Materials and Devices team of the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences basically solved the key scientific and technological issues such as multi-component precise control, ion doping and performance improvement, and high-precision array processing. Related basic research results were published in academic journals such as the Journal of the American Ceramic Society and the Journal of the European Ceramic Society (J. Am. Ceram. Soc., 2015, 98, 2352-2356; J. Euro. Ceram. Soc., 2015 , 35, 3879-3883; J. Phys. Chem. C, 2015, 119, 24558-24563; Ceram. Int., 2015, 41, 873-876; 2015, 41, 11598-11604). The GGAG scintillation ceramics produced by the team has achieved or even partially surpassed its key performance indicators in international mainstream commercial products, and is currently advancing the industrialization process.

In addition, the research team based on the traditional preparation technology of flashing ceramics, through innovative structural design, and actively explore the system of powder, ceramic function optimization and application areas. Recently, powders with a core-shell structure have been successfully prepared by introducing a second phase in a homogeneous precipitation system, and different activated ions have been placed in the corresponding shells so that a single particle has a completely separate luminescent center. The realization of the crystal field environment of active ions in the host material can be designed and the spectral output band can be adjusted in a wide range, which is of great significance for photon energy cutting in the research of luminescent materials and improving the overall luminous efficiency. Related work was published in the JMCC and was selected as the current cover of the magazine (J. Mater. Chem. C, 2016, 4, 244-247).

On the other hand, the research team used the ceramic low-temperature co-firing technology to design and fabricate a scintillation ceramic with a laminated structure, which is expected to realize the coordinated control of the X-ray blocking capability and the output band, which meets the needs of high-low-energy instantaneous detection applications and improves The matching of the detection material with the photosensitive element is of great significance (J. Eur. Ceram. Soc., 2016, 36, 2587-2591).

The research team also tried to improve the stability of the GGAG crystal structure by doping with Yb3+ ions, which is conducive to improving the ceramic transmittance. The excitation-emission spectra and fluorescence decay curves of Yb3+/Ce3+ co-doped GGAG ceramics were synthesized. It was found that there is a strong Ce3+→Yb3+ energy transfer process in this material system. Ce3+ ions can be absorbed in the UV-Vis region of 300-500 nm. The light is converted to Yb3+ ions in the near-infrared emission at 950-1100 nm. This makes Yb3+/Ce3+ co-doped GGAG transparent ceramics as a spectral modification material, which has potential application prospects in improving the energy conversion efficiency of crystalline silicon solar cells (Inorg. Chem., 2016, 55, 3040-3046).

At the same time, by adjusting the preparation process and chemical composition of GGAG, it can better match the excitation wavelength of the blue chip. The fluorescent ceramic package has a color rendering index of about 85 and a color temperature of about 5200K. On this basis, the team will expand into high-power LED fluorescent ceramics, laser ceramics and other fields, and continue to improve the research direction of its optical functional transparent ceramics.

The above work was supported by the National Natural Science Foundation of China (11404351, 51402317, 51502308), the Zhejiang Province Public Welfare Technology Project (2015C33104, 2016C31028) and the Ningbo 3315 Innovation Team.

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